c=input().split() x=c[0] a=c[1] b=c[2] n=c[3] if x=="z": print("a", end=" ") else: print(chr(ord(x)+1) , end=" ") if a=="z": print("a", end=" ") else: print(chr(ord(a)+1) , end=" ") if b=="z": print("a", end=" ") else: print(chr(ord(b)+1) , end=" ") if n=="z": print("a", end=" ") else: print(chr(ord(n)+1) , end=" ")